Safety gate for press

ABSTRACT

A safety gate held vertically in front of a press and a gate lift comprising a linkage system for moving the gate between a press exposing and a press blocking position. Spring means normally urge the lift into one of these positions, and a hydraulic motor or solenoid is connected to an initial link of the lift for normally urging the lift opposite thereto upon selective operation thereof.

O United States Patent 1151 3,641,84 1

Komori Feb. 15, 1972 54] SAFETY GATE FOR PRESS 2,171,523 9/1939 Frandsen ..74/615 2,240,915 5/1941 Searjeant ..74/615 [72] Inventor. Masahiro Komon, Tokyo, Japan 2,683,515 7/1954 Hem et alw [22] Filed: Mar. 13, 1970 2,724,287 11/1955 Knoth 3,186,256 6/1965 Reznick ..74/615 [21] Appl 19225 3,377,884 4/1968 Guy et al. ..74/615 [30] Foreign Application Priority Data Primary Examiner-William F. ODea Mar. 24, 1969 Japan ..44/21898 swam Shmmake' Sept. 10, 1969 Japan ..44/71268 521 U.S. c| ..74/615, 83/397, 100/53 [571 ABSTRACT [51] Int. Cl ..Fl6p 3/04 A safet y gate held vertlcally in front of a press and a gate lift [58] Field of Search ..74/6l5, 613, 612, 83/544, 397; comprising a linkage system for moving the gate between a 100/53 press exposing and a press blocking position. Spring means normally urge the lift into one of these positions, and a [56] References Cited hydraulic motor or solenoid is connected to an initial link of UNITED STATES PATENTS the lift for normally urging the lift opposite thereto upon selective o oration thereof. 1,259,554 3/l918 Pross ..74/6l3 p 1,536,762 5/1925 Broughton ..74/613 9 Claims, 23 Drawing Figures PATENTE0F615I972 3341 x341 SHEET 0 1 HF 20 1 N VEN TOR M-MR Moxwm MERIT;

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1. Safety apparatus for a press or the like having a base, a ram disposed above said base and mounted to reciprocate vertically with respect thereto, means selectively operating said ram to move up or down, said base and ram each carrying mating dies for manipulating a workpiece placed therebetween on the downward movement of said ram and engagement of said dies, said apparatus cOmprising a gate, support means for holding said gate vertically in front of said press, a lift assembly comprising a plurality of interconnected links for moving said gate from a first position exposing said engaging dies to a second position blocking said dies, spring means for urging said lift assembly normally into one of said positions, reciprocating motive means consisting of a fluid operated piston and cylinder connected to the initial link of said lift assembly and arranged to normally urge said lift assembly opposite thereto, and means for selectively operating said motive means to effect movement of said lift assembly from one position to the other.
 2. The apparatus according to claim 1, wherein said links maintain said gate in parallel arrangement to ground during movement between said first and second positions.
 3. Safety apparatus for a press or the like having a base, a ram disposed above said base and mounted to reciprocate vertically with respect thereto, means selectively operating said ram to move up or down, said base and ram each carrying mating dies for manipulating a workpiece placed therebetween on the downward movement of said ram and engagement of said dies, said apparatus comprising a gate, a support for holding said gate vertically in front of said press, a lift assembly comprising a plurality of interconnected links for moving said gate from a first position exposing said engaging dies to a second position blocking said dies, reciprocating motive means connected to the initial link of said lift assembly, means for selectively actuating said motive means to effect movement of said lift assembly from one position to another, switch means associated with said lift assembly and energizable on movement thereof from said first position to said second position to actuate said ram whereby said gate is positioned prior to engagement of said dies, said switch means being operable to return said gate to said first position prior to the return of said ram.
 4. The apparatus according to claim 3, wherein said motive means comprises a fluid piston and cylinder.
 5. The apparatus according to claim 3, wherein said motive means comprise an reversible motor.
 6. The apparatus according to claim 3, wherein said motive means comprises a solenoid.
 7. The apparatus according to claim 3, including circuit means associated with said ram to actuate the link assembly motive means on downward movement of said ram independently of said switch means.
 8. The apparatus according to claim 7, wherein said circuit means includes a switch associated with the ram drive and operable on movement of said drive to energize the motive means.
 9. Safety apparatus for a press or the like having a base, a ram disposed above said base and mounted to reciprocate vertically with respect thereto, means selectively operating said ram to move up or down, said base and ram each carrying mating dies for manipulating a workpiece placed therebetween on the downward movement of said ram and engagement of said dies, said apparatus comprising a gate, support means for holding said gate vertically in front of said press, a lift assembly comprising a plurality of interconnected links for moving said gate from a first position exposing said engaging dies to a second position blocking said dies, spring means for urging said lift assembly normally into one of said positions, reciprocating solenoid means connected to the initial link of said lift assembly and arranged normally to urge said lift assembly opposite thereto, and means for selectively operating said solenoid means to effect movement of said lift assembly from one position to the other. 